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(Warning - technical ahead!) ... Where can I find the pin diagram for the breakout cable of my old Omni I/O Break Out Box (non-USB)?

Hi - I would like to use my Omni I/O as a standalone unit - in other words independent of a computer. The following is kind of technical, but unfortunately I am not, so I could use some help please!

Here is the unit I am referring to, which served as my interface so well for so long:


http://www.soundonsound.com/sos/jan01...

On the old forum someone showed how I could use the unit in stand alone mode by buying and modifying a male-to-male D-Sub pin to fit into the female end of the breakout cable (the end that would normally go to a computer). This involved soldering the back end of that male end so that the signals coming from the Omni I/O box get turned right back around to the box. That way, all the outputs in the Omni I/O are available to use ... without a computer. Unfortunately, I think all the old posts are gone, and I can't proceed without knowing which pins need to be soldered to which other pin!

Can someone (maybe from M-Audio?) help me find that information? It was in the format of something like:

Pin # --- Assignment
1 - analog out1
2 - analog out2
9 - shared ground/shield for out1 and out2

3 - analog out3
4 - analog out4
11- shared ground/shield for out3 and out4

13- analog in1
6 - analog in2
14- shared ground/shield for in1 and in2

15- analog in3
8 - analog in4
7 - shared ground/shield for in3 and in4

Here is an example of the male-to-male D Sub pin I would buy. One end would fit into the "computer" end of the breakout cable (which is female), and the other end is where the pins would get soldered to each other. http://www.alliedelec.com/l-com-conne...



Finally, the link, now dead, in the old forum that had this information is (I believe):
http://forums.m-audio.com/showthread....

Thank you for any help ... this Omni I/O Studio box served me so well for so many years ... it would be nice if I could still be able to use it, great preamps, and a really cool set of features!
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  • Hello,

    Thanks for the post!

    I'm afraid I can't help here. Generally, M-Audio does not publish technical data or schematics like this.

    The other forum likely had someone with the technical knowledge to sort this on their own, or perhaps the information was posted by someone although it wasn't supposed to be.

    Maybe someone who knows will chime in.
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    OK, I can answer my own question after some work. It's not some mysterious secret from the innards of the machine, it can be easily tested by running signals into the Omni I/O and seeing which pins the signal appears on; and running a signal into the pins (using a 1/8 inch pin connected to a regular audio cable) and seeing which Direct Out the signal appears on. I'm really non-technical, so if I got it done, just about anyone can!

    Bottom line: The pin out assignments in my post above are *accurate* per my testing, for analog out1, analog in1, analog out2, analog in2 ... analog out4, analog in4.

    I tested them manually, so can vouch for them on my unit, and I imagine all of them.

    So the plan is to connect on the back side of that D-Sub pin I showed a picture of: analog in1 to analog out1; analog in2 to analog out2; ... analog in4 to analog out4. I don't know if I need to get them soldered, or if there are little wires that can connect all of them, but clearly it can be done (I have heard of someone who did it by soldering).

    Then the unit can be used WITHOUT being connected to a computer, for example live (two nice preamps, and a whole lot of ways to route four inputs), or alternatively, a really nice headphone amp with two outputs for the studio.

    (PS - after all those connections are made, I'm going to buy a shell to put on the back side to protect all the connections).

    Hope this helps some one else down the way!
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    Friend,

    I just lost the link, but I did find the pin out.

    It is as follows

    TRS Jack DB15 pin
    In 1 tip..............13
    In 1 ring.............term'd (Input ring terminations are 10k in series with 22uF to sleeve)
    In 1 Sleeve........14

    In 2 tip..............6
    In 2 ring............term'd
    In 2 sleeve........14 (Input 1 and 2 sleeves are tied together)

    In 3 tip..............15
    In 3 ring............term'd
    In 3 sleeve........7

    In 4 tip..............8
    In 4 ring............term'd
    In 4 sleeve........7 (Input 3 and 4 sleeves are tied together)

    Out 1 tip..........1
    Out 1 ring.........term'd (Output ring terminations are 130ohms in series with 22uF to sleeve)
    Out 1 sleeve.....9

    Out 2 tip..........2
    Out 2 ring.........term'd
    Out 2 sleeve.....9 (Outs 1 and 2 sleeves are tied together)

    Out 3 tip..........3
    Out 3 ring........term'd
    Out 3 sleeve....11

    Out 4 tip..........4
    Out 4 ring........term'd
    Out 4 sleeve....11 (Outs 3 and 4 sleeves are tied together)

    Pins 5, 10 and 12 are not used.
    Pins 14, 7, 9, and 11 (sleeves) are grounded at the sound card's ground plane
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  • ok, i managed to figure out the pin out and make the cable. if someone needs it, i'll upload images.
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